DORMA offers a choice of rugged dead bolts to provide an added level of protection. The D800 Series are Grade 1 dead bolts available in both 2-3/8" and 2-3/4" (standard) backsets. The large dead bolt is made from stainless steel for strength and corrosion resistance. A heavy duty brass cylinder in a hardened steel housing surrounded by a heavy steel spin ring complete the security package in the door. This is coupled with a solid steel strike for use in a hollow metal frame and an additional reinforcing plate with 3" screws for wood jamb installations. All of these features provide an exceptionally strong and secure dead bolt.